初始状态指令的功能是自动设置初始状态和特殊辅助继电器。
The original state instruction functions are to set automatically original state and the special auxiliary relay.
介绍了PLC内部数据寄存器和辅助继电器的分配，给出了部分程序指令。
The distribution of the data registers and auxiliary relays in the PLC is introduced, then some part of instructions are given.
在该控制系统中，操作人员通过PLC发出指令，驱动时间继电器。
In the control system, operating through the PLC issued a directive, the drive time relay.
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